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Significant cleanups in SysV IPC handling (shared mem and semaphores).

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IPC key assignment will now work correctly even when multiple postmasters
are using same logical port number (which is possible given -k switch).
There is only one shared-mem segment per postmaster now, not 3.
Rip out broken code for non-TAS case in bufmgr and xlog, substitute a
complete S_LOCK emulation using semaphores in spin.c.  TAS and non-TAS
logic is now exactly the same.
When deadlock is detected, "Deadlock detected" is now the elog(ERROR)
message, rather than a NOTICE that comes out before an unhelpful ERROR.
This commit is contained in:
Tom Lane
2000-11-28 23:27:57 +00:00
parent 914822713c
commit c715fdea26
27 changed files with 1172 additions and 1755 deletions
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10
src/backend/access/transam/xlog.c
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.35 2000/11/27 05:36:12 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.36 2000/11/28 23:27:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -85,12 +85,6 @@ typedef struct XLogCtlWrite
} XLogCtlWrite;
#ifndef HAS_TEST_AND_SET
#define TAS(lck) 0
#define S_UNLOCK(lck)
#define S_INIT_LOCK(lck)
#endif
typedef struct XLogCtlData
{
XLogCtlInsert Insert;
@ -102,12 +96,10 @@ typedef struct XLogCtlData
uint32 XLogCacheByte;
uint32 XLogCacheBlck;
StartUpID ThisStartUpID;
#ifdef HAS_TEST_AND_SET
slock_t insert_lck;
slock_t info_lck;
slock_t lgwr_lck;
slock_t chkp_lck; /* checkpoint lock */
#endif
} XLogCtlData;
static XLogCtlData *XLogCtl = NULL;